Impossible to upgrade online

I have seen another user with the same issue. The online upgrading platform does not work. The website keeps loading, add item to cart and can't check out as there's no item in cart? If you go to the store there's no stock.... I did manage to get through to someone on facebook messenger which was helpful but not the point. I do not have my phone near me during office hours to answer all the Vodacom calls to upgrade. I was hoping to make use of the online exclusives but it looks like I'm skipping the upgrade this round